The most basic of economics...supply and demand.
There is greater demand for leopards, therefore they bring higher prices.
X2
Most people want a dog that's looks are appealing to them. But I think that the merle color is "cool" to have for some people. I have often wondered, same as you, why a person would ask more for a merle colored pup than a solid out of the same litter...the only explanation, is that the person is selling for looks and not ability
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